Z code
For the virtual machine language introduced by Infocom, see
Z-machine.
Z Code (like Q Code and X Code) is a set of codes used in CW, TTY and RTTY radio communication. Actually, there are different sets of Z-codes: one originally developed by Cable & Wireless Ltd., for commercial communications in the early days of wire and radio communications, another one independently developed by NATO forces later for military needs and use. The NATO Z Code is still in use today, and is published in the unclassified document ACP-131. There are other set of codes internally used by USSR's military and other operating agencies. The old C&W Z Codes are not widely used today.
Some Example Z Codes
| Code |
Meaning |
| ZAL |
I am closing down (until...) due to.... |
| ZAP |
Work...(1. Simplex; 2. Duplex; 3. Diplex; 4. Multiplex; 5. Single Sideband; 6. With automatic error correction system; 7. Without automatic error correction system. 8. With time and frequency diversity modem). |
| ZBK |
Are you receiving my traffic clear? |
| ZBK1 |
I am receiving your traffic clear |
| ZBK2 |
I am receiving your traffic garbled |
| ZBM2 |
Place a competent operator on this circuit |
| ZLD2 |
I cannot transmit pictures. |
| ZSF |
Switch off...(1. IFF; 2. IFF sets for 10 minutes in area denoted except for ships whose call signs follow). |
| ZBW no. |
Change to backup frequency no. |
| ZBZ(1-5). |
Measure of Printability (Where 1=Garbled/unreadable & 5=Perfect) |
In this example, the ZBK/1/2 is a Z code from the NATO military set, while the others are old C&W Z-codes. A lot of the old C&W codes are derived from mnemonics (ZAL = (a)lter wave(l)ength, ZAP = (a)ck (p)lease, ZSF = (s)end (f)aster, etc.),
See also
External links
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| Notable signals |
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Other writing systems
in Morse code |
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